carbuncle的复数形式怎么拼写？

carbuncle的音标：carbuncle的英式发音音标为：['kɑ:bʌŋkl]carbuncle的美式发音音标为：['kɑrbʌŋkl]...

n.红榴石，红宝石，痈...

He has a carbuncle on his neck, it feels extremely painful.他的脖子上长了砍头疮, 痛苦极了....